Mensa Kakuro : What could be more appealing to Mensa members â or anyone who enjoys a good challenge â than a cunning test of intelligence and logic? Thatâs exactly what these 250 puzzles provide. The trick to kakuro is in making it all add up: the game begins with a grid that looks like a crossword, except that some squares contain small numbers in the corner. Fill in all the empty boxes using the numbers 1 to 9 without repeats so that the sum of each horizontal set of digits equals the number in the black triangle to its left, and the sum of each vertical set of digits equals the number in the triangle above it. The kakuro puzzles start out simple â¦ and get more difficult as the book progresses. NOTE: This is a Scratch and Dent book and may have noticeable dents, scratches and various other cosmetic issues as well as torn or missing dust jacket. These items are only guaranteed to be structurally complete and readable and therefore are sold as is.